peters



N. FEYERS, PHOTO-LITHOGHAFMER, WASHINGTON. D. C.

UNrrn sfrarns PATEN ENOS ROGERS, OF NEV YORK, N. Y.

MODE OF GRINDING PUPPET-VALVES WHILE THE ENGINE IS IN MOTION.

Specification of Letters Patent No. 9,103, dated July 6, 1852.

To all whom 'Lt may concern:

Y Be it known that I, Enos ROGERS, of the city, county, and State of New York, have invented a new and Improved Mode of Grinding the Puppet-Valves of Steam-Engines; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings and to the letters of reference marked thereon.

The nature of my invention consists in a combination of certain mechanical elements, so adjusted and applied to the valves of steam engines while in use that the valves thereby are caused to rotate slowly upon their seats during the period of time that they remain shut.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

Figure I is an elevation of a common low pressure engine, the front of the lower steam box being removed so as to exhibit the operation of the valves. E represents the steam valve shut, and F the exhaust valve open.

At A and B in Fig. I are shown the rock shaft composed of two parts A and B, the part B being hollow and A passing through B, as indicated by dotted lines on B. Upon this shaftare fixed the lifters for lifting the rods D D.

At C C are shown two arms attached to the rods D D, and communicating with the valves as shown at C C, the journals of the valve stems being at liberty to revolve freely as shown at C C.

Upon the upper portion of the valve shafts E and F are placed two screw wheels i z', which are supported by and at liberty to revolve within the crossbar J, those screw wheels having elongated hubs cast with the wheel, the lower end of which is sufficiently large to form a collar which prevents the wheels from being raised by the upward motion of the valve stem. The wheels z' z' have a square hole in their center, one of which is shown in Fig. III, together with its pinion in plan and elevation. The top portion of the valve stems are also square and at liberty to slide up or down through the wheels Upon the end of the pinion shafts are placed ratchet wheels R R, as shown in plan Fig. III. One of the ratchet wheels is shown at R enlarged.

Upon either part of the rock shaft A and B is shown an arm marked L L, to the end of which are attached two hooks H H by means of a common wrist. Those hooks hang in a perpendicular position, and by a vibrating motion of the rock shaft the hooks H H rise and fall each alternately, while at every upward motion the hook H catches holdA of one of the ratchet wheels and turns it, together with its pinion, a small portion of a revolution, and thereby causing its fellow wheel c' to rotate in a horizontal position and causing the valve stem or shaft to turn, carrying with it the valves, as shown at E, Fig. I, the valve only turningduring the time it remains shut.

From the foregoing description it will be seen that by the vibration of the rock shaft, as shown at N and T in Fig. II, that the hooks H H by means of the arms L L are carried up or down at each vibration of the shaft from N to T, and vice versa.

At A in Fig. II is shown one of the lifters attached to the rock shaft for lifting the rods D D. The form of this lifter is such that the rod D in its descent arrives at the bottom of its stroke before the rock shaft terminates its vibration from T to N and that during that part of the vibration of the rock shaft-viz., after the valve has dropped upon its seat-one of the hooks near the termination of its upward stroke catches hold of the ratchet wheel R and turns it about one inch, (more or less,) and by means of the screw pinion and wheel z' the valve E is turned upon its seat, the motion being brought on very gently by the screw wheel z'. Upon reversing the motion the valve F is ground in turn. The motion being continued each valve is ground in turn, rotating at about one revolution per hour, whereby the valves are kept in good condition and always tight, without stopping the boat or 

